<template>
  <div class="upload-file">
    <el-upload
      multiple
      :action="uploadFileUrl"
      :before-upload="handleBeforeUpload"
      :file-list="fileList"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      :on-success="handleUploadSuccess"
      :show-file-list="false"
      :headers="headers"
      class="upload-file-uploader"
      ref="fileUpload"
    >
      <!-- 上传按钮 -->
      <el-button type="primary">{{ title }}</el-button>
    </el-upload>
    <!-- 上传提示 -->
    <div class="el-upload__tip" v-if="showTip">
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      的文件
    </div>
    <!-- 文件列表 -->
    <transition-group class="upload-file-list el-upload-list el-upload-list--text" name="el-fade-in-linear" tag="ul">
      <li :key="file.uid" class="el-upload-list__item ele-upload-list__item-content" v-for="(file, index) in fileList">
        <el-link :href="`${baseUrl}${file.url}`" :underline="false" target="_blank">
          <span class="el-icon-document"> {{ file.name }} </span>
          <!-- <span class="el-icon-document"> {{ file.name}} </span> -->
        </el-link>
        <div class="ele-upload-list__item-content-action" v-show="viewShow">
          <el-link :underline="false" @click="handleDelete(index)" type="danger">删除</el-link>
        </div>
      </li>
    </transition-group>
  </div>
</template>

<script setup>
import { getToken } from "@/utils/auth";
import { fileDel } from "@/api/file";
const props = defineProps({
  modelValue: [String, Object, Array],
  title:{
    type:String,
    default:'上传文件'},
  // 数量限制
  limit: {
    type: Number,
    default: 5,
  },
  // 大小限制(MB)
  fileSize: {
    type: Number,
    default: 5,
  },
  // 文件类型, 例如['png', 'jpg', 'jpeg']
  fileType: {
    type: Array,
    default: () => ["doc", "docx", "xls", "ppt", "txt", "pdf"],
  },
  // 是否显示提示
  isShowTip: {
    type: Boolean,
    default: true,
  },
  //是否显示删除
  viewShow: {
    type: Boolean,
    default: true,
  },
});

const { proxy } = getCurrentInstance();
const emit = defineEmits();
const number = ref(0);
const uploadList = ref([]);
const baseUrl = import.meta.env.VITE_APP_BASE_API;
const uploadFileUrl = ref(baseUrl + "/file/upload"); // 上传文件服务器地址
const headers = ref({ Token: getToken() });
const fileList = ref([]);
const file_name = ref("");
const showTip = computed(() => props.isShowTip && (props.fileType || props.fileSize));

watch(
  () => props.modelValue,
  (val) => {
    if (val) {
      let temp = 1;
      // 首先将值转为数组
      const list = Array.isArray(val) ? val : props.modelValue.split(",");
      // 然后将数组转为对象数组
      fileList.value = list.map((item) => {
        if (typeof item === "string") {
          item = { name: item, url: item };
        }
        item.uid = item.uid || new Date().getTime() + temp++;
        return item;
      });
    } else {
      fileList.value = [];
      return [];
    }
  },
  { deep: true, immediate: true }
);

// 上传前校检格式和大小
function handleBeforeUpload(file) {
  // 校检文件类型
  if (props.fileType.length) {
    const fileName = file.name.split(".");
    const fileExt = fileName[fileName.length - 1];
    const isTypeOk = props.fileType.indexOf(fileExt) >= 0;
    if (!isTypeOk) {
      proxy.$modal.msgError(`文件格式不正确, 请上传${props.fileType.join("/")}格式文件!`);
      return false;
    }
  }
  // 校检文件大小
  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize;
    if (!isLt) {
      proxy.$modal.msgError(`上传文件大小不能超过 ${props.fileSize} MB!`);
      return false;
    }
  }
  proxy.$modal.loading("正在上传文件，请稍候...");
  number.value++;
  return true;
}

// 文件个数超出
function handleExceed() {
  proxy.$modal.closeLoading();
  proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
}

// 上传失败
function handleUploadError(err) {
  proxy.$modal.closeLoading();
  proxy.$modal.msgError("上传文件失败");
}

// 上传成功回调
function handleUploadSuccess(res, file) {
  if (res.code == 200) {
    file_name.value = file.name;
    uploadList.value.push({ name: res.data.file_name, url: `/file/download?file_name=${encodeURIComponent(res.data.file_name)}&file_path=${res.data.file_path}`, filePath: res.data.file_path });

    uploadedSuccessfully();
  } else {
    number.value--;
    proxy.$modal.closeLoading();
    proxy.$modal.msgError(res.msg);
    proxy.$refs.fileUpload.handleRemove(file);
    uploadedSuccessfully();
  }
}
// 删除文件
function handleDelete(index) {
  fileDel(fileList.value[index].filePath).then((res) => {
    proxy.$modal.msgSuccess("文件删除成功");
    fileList.value.splice(index, 1);
    emit("update:modelValue", listToString(fileList.value));
  });
}

// 上传结束处理
function uploadedSuccessfully() {
  if (number.value > 0 && uploadList.value.length === number.value) {
    fileList.value = fileList.value.filter((f) => f.url !== undefined).concat(uploadList.value);
    uploadList.value = [];
    number.value = 0;
    emit("update:modelValue", listToString(fileList.value));
    proxy.$modal.closeLoading();
  }
}

// 获取文件名称
function getFileName(name) {
  if (name.lastIndexOf("/") > -1) {
    return name.slice(name.lastIndexOf("/") + 1);
  } else {
    return "";
  }
}
//获取文件信息
function getFileInfo() {
  if (fileList.value.length > 0) {
    return { fileName: nameToString(fileList.value, "name"), filePath: nameToString(fileList.value, "filePath") };
  } else {
    return { fileName: "", filePath: "" };
  }
}
//获取文件信息
function getFileInfos() {
  if (fileList.value.length > 0) {
    return fileList.value;
  } else {
    return { fileName: "", filePath: "" };
  }
}
//展示文件
function showFileList(name, path) {
  uploadList.value = fileStringToArray(name, path);
  fileList.value = fileList.value.filter((f) => f.url !== undefined).concat(uploadList.value);
  uploadList.value = [];
  emit("update:modelValue", listToString(fileList.value));
}
// 对象转成指定字符串分隔
function nameToString(list, name) {
  let strs = "";
  let separator = ",";
  for (let i in list) {
    if (list[i][name]) {
      strs += list[i][name] + separator;
    }
  }
  return strs != "" ? strs.substr(0, strs.length - 1) : "";
}
// 指定字符串转数组
function fileStringToArray(name, path) {
  let fielsArr = [],
    nameArr = [],
    pathArr = [];
  if (name) {
    nameArr = name.split(",");
    pathArr = path.split(",");
    for (let i in nameArr) {
      fielsArr.push({ name: nameArr[i], url: `/file/download?file_name=${encodeURIComponent(nameArr[i])}&file_path=${pathArr[i]}`, filePath: pathArr[i] });
    }
  }
  return fielsArr;
}
// 对象转成指定字符串分隔
function listToString(list, separator) {
  let strs = "";
  separator = separator || ",";
  for (let i in list) {
    if (list[i].url) {
      strs += list[i].url + separator;
    }
  }
  return strs != "" ? strs.substr(0, strs.length - 1) : "";
}
defineExpose({
  getFileInfo,
  showFileList,
  getFileInfos,
});
</script>

<style scoped lang="scss">
.upload-file-uploader {
  margin-bottom: 5px;
}
.upload-file-list .el-upload-list__item {
  border: 1px solid #e4e7ed;
  line-height: 2;
  margin-bottom: 10px;
  position: relative;
}

.upload-file-list .el-link{
  word-break: break-all;
  line-height: 1;
}
.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}
.ele-upload-list__item-content-action .el-link {
  width: 36px;
  margin-right: 10px;
}
</style>
